Fuse.



fR. `I. BBRNARDINI.

f russ. APPLICATION4 FILED IAB. 25, 1911.

` Ra/LJ Pisana/Jam'.

IELOIil-XNIDA P. BERNARDINI, OF PROVIDENCE, RHODE ISLAND.

FUSE.

Specification of Letters Patent.

Patented June 6, 1911.

Application filed March 25, 1911. Serial No. 616,92..

To all whom 'it 'may concern:

Be it known that I, ROLAND I. BERNAR- DINn a citizen of the lflnited States, and l resident` of the city of Providence, in the '5 county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to a safety fuse of the cartridge type for electric circuits, and

' has for its object to provide a simple and practical meansfor retaining the ends of the destructible fuse wire within the cartridge shell by means of a ready removable binding plug and without the use of solder. A further objectof the invention is to also provide a readily removable socket cap for receiving said binding plug whereby the Whole end of the cartridge casi-ng may be l ZOopened to quickly empty the same of its finely divided gas absorbing material and to quickly replace the destroyed fuse by a fresh one; "With these and other objects in view, the a54 invention consists of certain novel features of construction, as will be more fully described and particularly pointed, out inthe appended claims. i

f the accompanying drawingsLFigure 3u 1f-is a side elevation of a cartridge fuse, partly in section, illustrating my. improved cartridge ends in position on the casing. Fig. 2- is a sectional view of the socketcap `which fits Vboth over the outside and also on 353th@ inside of the casing and is adapted to receive the binding plug therein. Fig. 3c is an end view of said socket cap showing the recess for receiving the end of the fusible A lstrip. Fi 4 is a side elevation of the obindins p 11e j Referring to the drawings, l isthe outer lcasing of the cartridge which may be constructed of anyT suitable insulating material.

On either end of this `casing is secured a. iwsocket cap 2,- the same being constructed with an'outer annular' band 3 to inclose the end of the casing, and an inwardly extending annular wall 4 projecting into the inside of the casing. .Between this inner and outer 0 qwall is foriued an annular' chamber 5 for the .reception of the end' of the easingr 1. The internal 4surface the inner wall of this socket capfis thei aded as at (3 and the end i of this Wall vis contracted on an incline or tapered as at 7 to reeeivethe frusto-conical end ofthe plug 8, presently described. The

with an ear 17 which may be of anyl con'- tapered portion of this wall 7 is provided on its inner side with a slot or recess 9 into which the end 10, see Fig. 1, of the fusible strip 11 is designed to fit, the size of the slot 60 indicating the capacity of the fuse strip, and the slot being of such adepth that a part of the fusestrip will project to be engaged and bound by the plug 8 when the same is positioned. The outer band 3 of this socket cap is provided with one or more angular slots 12 forming a bayonet joint through which the retaining screws 13 may pass, said screws being adapted to also pass tliirough theeasing l and threaded into the inner Wall 4 of the socket cap so that when it is desired to remove this cap it is only necessary to Withdraw the ends of the screws from the inner wall 4, then by rotating the cap slightly it can be readily withdrawn from its position on the casing.

The plug 8 has a straight body portion threaded as at 14 and a tapering frustoconical end 15 corresponding with and adapted to fit into the tapering portion of the socket cap. This plug is provided with a slot 16 in its end to receive a screw* driver ,whereby it may be readily removed when desired and the saine may be also provided venient shape to engage any form of binding post or fuse block to which the cartridge may be connected.

When a cartridge. fuse of the type described blows, it is intended that the same shall be replaced by afresh cartridge, but oftentimes the attendant has no fresh supply on hand and it is necessary to make a quie repair. I have found by practical experience that by providing the cartridges with my improved socket cap and plug a quick, permanent and safe repair may be made even by an unskilled person, it being only necessary to take a screw driver or a pair of pliers, remove the plugs 8, empty out the filling, inserta new fusible strip` place one end of the same in the. slot 9 and screw in .oneplug firmly binding this end in position. Then return the filling to the casing, place the o posite end of the strip in its slot 9, Screw in the .binding plug and the whole is complete and as good as new, and this with but a fewl minutes work and without the use of solder. If in replacinga fuse strip it isfound that the end of the strip on hand is not thick 110 enough to a little more than till the slot 9 thenV the end may be bent over upon itself so that the plug will engage and hind i when positioned in its socket.

1. A safety fuse of the cartridge type, comprising a. casing, n cap provided with a socket and reniovably secured to the ends of said casing, the inner Wall of the socket portion of said cap being provided Wit-h a recess for the reception of the fuse strip end, and u, screw threaded plug adapted to be screwed into said socket to engage and bindv said fuse stripin said recess.

2. A safety fuse of the cartridge type, comprising a easing"7 a cap provided with an 15 inwardly turned socket" and removably secured to the ends of said casing, a portion of the inner wall of the socket portion being set, on an incline and provided with g1 recess for the reception of the fuse strip end, and n Screw threaded plug having .f1 correspond- 20 ingly tapering portion,adapted to be screwed into Said socket to engage and bind said fuse Strip against the recess wall.

lIn testimony whereof I affix my signature in presence of two witnesses.

'RLAND P. BERNARDNI.

Witnesses HOWARD E. BARL0\V, lE. I. Comm. 

